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1. Yet even this address is not complete, because the vast structure we just described is only the local universe. 5 cosmic address? trillion kilometers (km) or 6 trillion miles. 7 billion light-years—and within this volume we estimate that there are hundreds of billions of galaxies, roughly as many galaxies as there are stars in the Milky Way. In addition, scientists have concluded that our universe contains much more than the observed planets, stars, and galaxies. Up to 95 percent of the universe is made up of matter that does not emit light (called dark matter) and a form of energy that permeates all of space (dark energy)—neither of which is well understood.

A scientiﬁc principle is a general idea or sense about how the universe is that guides the construction of new theories. Occam’s razor, for example, is a guiding principle in science stating that when we are faced with two hypotheses that explain a particular phenomenon equally well, we should adopt the simpler of the two, unless the more complicated answer better matches the results of observations or experiment. Another principle comes from the late astronomer Carl Sagan (1934–1996) and is often phrased as “Extraordinary Claims Require Extraordinary Evidence,” meaning that when making a new and truly extraordinary claim that has not been tested, conﬁrmed, or proven, extraordinary evidence is required.